I really don't like some aspects of the e-roll, but as a starter, then yes, it's probably one of the best (maybe the best) mini e-cig.
The advantage it has over many batteries is the portable charging and the power of the battery. IF (and this is the deal breaker for me) it worked with other accessories, which i don't believe it does, I would buy one *instantly*.
However, the atomizers don't last very well, the cartridges only hold 0.4ml (which would mean 5 carts for me, per day, worth of filling) and there have always been issues with leaking (although not universal I must admit).
For less money you can get mini ego batteries and have complete choice of what to use on it. I would say a mini ego battery with a good clearomizer beats the e-roll in every department.
BUT people love them and will say it's the best thing ever....and won't hear any different.
e-roll is £55 in the UK. For less you can get mini egos, 3 clearomisers, some liquid and a charger....and not spend your life filling stupid little cartridges that are rather old-school, expensive and unpredictable.